Rotating Transparent Plate for Satellite Image Stabilization
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Solution Overview
Problem
High-velocity satellite imaging systems experience image smearing due to motion, which reduces image quality and integration time, and existing solutions require complex mechanical systems like fast steering mirrors that are large and inefficient.
Innovation Solution
A rotating transparent plate is introduced between the focal plane array and the lens to counteract image motion, allowing for backscanning and increasing integration time, thereby improving signal-to-noise ratio and reducing the need for bulky mechanical stabilizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional staring sensors are used in low earth orbit imaging, then the system structure is simple, but image smearing occurs due to high ground velocity
Solution Approach 1:
The patent replaces complex mechanical stabilization systems (such as fast steering mirrors and active optics) with a static transparent plate having predetermined curvature. This optical element passively compensates for image smearing caused by high ground velocity, eliminating the need for moving parts and complex control mechanisms while maintaining image quality.
Solution Approach 2:
The patent modifies the optical parameters of the imaging system by introducing a transparent plate with specific curvature radii (R1 and R2) and refractive index. These parameter changes create a controlled optical path difference that compensates for the temporal dispersion and image smearing effects, transforming the system's optical characteristics to achieve stabilization without mechanical movement.
2Reliability
If integration time is increased to improve signal-to-noise ratio, then image quality improves, but image smearing increases due to platform motion
Solution Approach 1:
The patent replaces active mechanical correction systems with a static optical element that enables longer integration times. The transparent plate's predetermined curvature creates an optical path that compensates for platform motion during extended exposure, allowing signal-to-noise ratio improvement without proportionally increasing image smear.
Solution Approach 2:
The transparent plate is designed with pre-calculated curvature parameters that anticipate and counteract the effects of platform motion during integration. The optical path difference introduced by the plate's curvature proactively compensates for the temporal dispersion that would otherwise occur during long-exposure imaging, preventing image smear before it degrades quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The transparent plate system effectively stabilizes images during high-velocity motion, enhancing image quality by increasing integration time and allowing for more frames to be captured without the bulk of traditional stabilization systems, resulting in improved signal-to-noise ratio and reduced system weight and complexity.
Implementation Method 1
A rotating transparent plate is introduced between the focal plane array and the lens to counteract image motion
Data Source
AI summary
A method of using an imaging system including a focal plane with one or more detectors, a lens optically coupled to the focal plane, a transparent plate optically coupled to the focal plane and lens, and an actuator coupled to the transparent plate, includes receiving, at a first area of the focal plane through the lens, light from an object at a first time. The imaging system is located in a first position relative to the object at the first time. The method also includes causing the actuator to move the transparent plate in response to movement of the imaging system relative to the object and receiving, at the first area of the focal plane through the lens, light from the object at a second time. The imaging system is located in a second position relative to the object at the second time.